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Does the Amazon provide 20% of our oxygen?

yadvindermalhi.org

101–110 of 227 posts

Re: Does the Amazon provide 20% of our oxygen?

#101
post #100

Earlier quoted context omitted.

https://wwf.panda.org/knowledge_hub/where_we_work/amazon/ama... it's just less accessible but I'm pretty sure like any forest on the face of the earth, portions of dead animal and plant matter is getting sequestered into the ground while another portion is getting exhaled by animals eating the leaves or other animals eating the animals. The stuff that's getting sequestered though is probably miniscule. At the timesca…

Even if a tiny amount was sequestered each year over the course of 55 million years there would be a huge pile of carbon there. But it isn’t there, is it?

my initial reply was a post about oil mining in the amazon...

Additionally tectonic plates move, 55 million years ago the amazon probably wasn't even there. Additionally oil found on land could've been produced by biomass under the ocean and vice versa it's all moving around all the time. Likely the oil found underneath the amazon could have been produced at a time where that tectonic plate was under water.

Re: Does the Amazon provide 20% of our oxygen?

#102

I haven't been following this specific news story, but I remember from my environmental sociology class that fire prevention in forests eventually leads to unnatural states that are then prone to massive uncontainable fires. Have they been suppressing natural fire in this region for too long? If this fire is naturally burning, then isn't the best response to let it run its course unless human lives are threatened?

The Amazon does not burn naturally. Fires there are man made to clear land for agriculture.

Re: Does the Amazon provide 20% of our oxygen?

#103

Earlier quoted context omitted.

I hear this brought up a lot. Can you name a drug that has actually passed all the safety and efficacy trials that has been developed from something in the Amazon?

Quinine for one. There are many more if you are willing to do five minutes of research: https://www.conservation.org/blog/5-rainforest-species-that-...

> There are many more if you are willing to do five minutes of research

but thats also how you end up on a geocities site about anti vaxxing because big pharma doesn't want you to know about the amazon and yell "exactly, I knew it all along!"

Re: Does the Amazon provide 20% of our oxygen?

#105
post #71

A few comments are saying that forests capture a lot of CO2. But how could that be? If a forest doesn't change over thousands of years it cannot be accumulating carbon in any significant quantity. Or else where would that material go? The Amazon trees are about as tall and wide today as they were 10,000 years ago, and only so many of them fit on a given area. If the amount of vegetation remains the same the only way…

Doesn't burning the forest down release a good portion of that CO2?

Re: Does the Amazon provide 20% of our oxygen?

#107

I haven't been following this specific news story, but I remember from my environmental sociology class that fire prevention in forests eventually leads to unnatural states that are then prone to massive uncontainable fires. Have they been suppressing natural fire in this region for too long? If this fire is naturally burning, then isn't the best response to let it run its course unless human lives are threatened?

The Amazon does not burn naturally. Fires there are man made to clear land for agriculture.

Agriculture and mining: https://www.aljazeera.com/ajimpact/brazilian-gold-rush-destr...

Re: Does the Amazon provide 20% of our oxygen?

#108
post #97
post #31

Earlier quoted context omitted.

There is no single tipping point. There are a vast number of different tipping points with different outcomes.

Which is to say, there is no tipping point?

More that many systems are involved, and they are not all binary choices. So, local flooding for example does not operate on the same scale as ocean acidification.

Re: Does the Amazon provide 20% of our oxygen?

#109

Earlier quoted context omitted.

>> In contrast, other newspaper topics like politics, sports, business, etc. are often literal reporting of what people do This comment should be preserved for all time and cited in the Gell-Mann Effect entry. Do you really think physics is infinitely more complicated than finance or politics?

I'm not sure about that specifically, but reporting on politics is much closer to the paper's core competency. The paper runs articles on politics every single day . The characters and issues don't change too quickly: Quimby was the mayor last week; next week, he'll be the same mayor, dogged by the same scandals and trying to enact the same politics too. A lot of the facts are easy to check, if someone cared to do so…

> reporting on politics is much closer to the paper's core competency.

And despite this, most of the media got the two of the most significant political happenings of the last 5 years (US elections and Brexit) completely wrong.

Re: Does the Amazon provide 20% of our oxygen?

#110
post #83

Earlier quoted context omitted.

Isn't it 20% of sequestered carbon , not CO2? Burning that carbon to CO2 requires oxygen, which will deplete the atmospheric reservoir to some degree.

But isn’t there oxygen in the organic materials of the tree?

I think the oxygen in the tree materials is already combined with carbon in the form of CxHyOz hydrocarbons, where x,y,z = atoms of the respective atomic species.

Burning cellulose (poly-C6 H10 O5) to CO2 and H2O would require (for each molecule): 12O (for 6CO2) and 5O (for 5H2O). This is a total of 17O.

Cellulose contains only 5O, so 12O (or 6O2) would be required for a full stoichiometric burn of cellulose.

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